The purpose of a BOV/BCV is the allow that excess pressure to escape. It works through a vacuum port on the BOV/BCV which enables it to measure relative manifold pressure. When the throttle body closes, a vacuum inside the manifold will be created. If the relative manifold pressure drops below atmospheric pressure, the valve opens and allows air through it.
Universal Manual Adjustable Forged Wastegate Actuator and Spring Thank you for purchasing this Kinugawa Turbo Systems TM product for your car! Installation of this product should only be performed by persons experienced with installation of aftermarket performance.